You are admiring an early and rare WW2 bomb tag with cotter pin. These, of course, were used to activate and deactivate the fuses on bombs, before deployment. They were also used as zippullers by bombardment crews. Period photos often show this on A-2 and B-3 flight jackets. Needless to say this looks very cool on a puller even in today’s world. Can be used on your original jackets or high end repros. Will look just great on a Good Wear or Eastman A-2 or B-3 for instance. Make it yours!